Two stage electrohydraulic pressure control valve

Details Two stage electrohydraulic pressure control valve Two stage electrohydraulic pressure control valve

1995-09-26

1996-10-08

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

91433, 192109F, F15B 13043

Patent

active

055621252

ABSTRACT:
A two stage electrohydraulic pressure control valve includes a pilot stage for providing regulated pressure at lower flows to a larger main stage that handles the higher control flows to and from a pressure applied clutch or pressure released brake. The regulated pressure from the pilot stage acts on an end of the main stage for controlling the position of the main stage. An energy storage device in the form of either an accumulator or a load piston device is connected to the end of the main stage to permit instantaneous independent movement of the main stage relative to the pilot stage. The energy storage device quickly provides for or accepts displaced fluid from the main stage much faster than the limited flow capacity and response time of the pilot stage. This permits the main stage to quickly adjust to flow changes to the clutch or brake with minimal change in pressure until the pilot stage can respond.

REFERENCES:
patent: 5051631 (1991-09-01), Anderson
patent: 5054599 (1991-10-01), Marcott
patent: 5136898 (1992-08-01), Hirose

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